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I think we are getting confused about terminology a bit. A fuse block can have a negative buss bar built into it That is what you want to use.

Simply run you leads form the battery to this fuse block. Power your accessories off of it.

Yes, *some* electronics will do better with their own leads from the battery to reduce RF interference, but not all.

Montauks made after about 1983 included a fuse or circuit breaker in the stern of the boat to protect the run from the battery to the fuse block in the console. Earlier Whalers did not.